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Minchanka [31]
2 years ago
10

15 points!!

Mathematics
2 answers:
Katarina [22]2 years ago
8 0

Answer:

C. 394.2 ft²

Explanation:

surface area of triangular prism: (a+ b + c) × length + base × height

Here given:

  • a = 9 ft
  • b = 9 ft
  • c = 9 ft
  • base = 9 ft
  • length = 12 ft
  • height = 7.8 ft

Applying the formula:

  • (9+ 9 + 9) × 12 + 9 × 7.8
  • 394.2 ft²
saveliy_v [14]2 years ago
6 0

Answer:

b

Step-by-step explanation:

9x7.8x1/2x12

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